I visited three islands for my Honeymoon in 2014: The Big Island, Kauai and Oahu. I just came back from a Christmas vacation in Maui so I can say that I have a good knowledge of Hawaii.
BIG ISLAND – The Explorer’s Paradise
The Big Island is the explorer’s paradise because there are countless unique landscapes to discover. Number one must do is the Kilauea Iki Trail in the Hawaii Volcanoes National Park. It doesn’t happen every day to walk on sedimented lava of million years. My advice is to go in the afternoon because you have to wait for the dark to see the caldera of the volcano Kilauea glowing in the night sky. It takes a couple of hours to do the trail (you will be tired) then you can visit the museum waiting for sunset.